3361 Orpheus (1982 HR)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3231610634 ± 2.00e+00
Semi-major axis (a)1.2101508924 AU ± 3.00e+00
Inclination (i)2.65169834° ± 4.00e+00
Long. of Asc. Node (Ω)188.44299382° ± 5.00e+00
Arg. of Perihelion (ω)302.64499143° ± 6.00e+00
Mean Anomaly (M)320.54810304° ± 1.29e-06
Mean Motion (n)0.7403771180°/day ± 2.75e+00
Perihelion dist (q)0.81907724 AU ± 3.16e+00
Aphelion dist (Q)1.60122454 AU ± 4.65e+00
Orbital Period1.33124898 yr ± 4.95e+00
NGA Modelr2
A22.56523269e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.50
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-26
RMS Residual0.382″
Uncertainty0
Orbit TypeApollo
MOID0.014472 AU
Observations Used3021
Oppositions11
Arc Total1982-2025
First Observation Used1982-04-24
Last Observation Used2025-11-19
Observations (4857)
Date Type RA Dec Mag Band Observatory
2021-10-17 19:43:56 s 1 +39614.573 0 +365805.08 4030.0 C57
2021-10-17 20:03:56 S 02 52 39.713 +11 15 45.61 V C57
2021-10-17 20:03:56 s 1 +38887.805 0 +366024.45 6600.0 C57
2021-10-17 20:13:56 S 02 52 39.653 +11 15 33.41 V C57
2021-10-17 20:13:56 s 1 +38524.251 0 +366132.55 7420.0 C57
2021-10-17 20:23:56 S 02 52 39.485 +11 15 25.31 V C57
2021-10-17 20:23:56 s 1 +38160.585 0 +366239.59 7930.0 C57
2021-10-17 20:43:56 S 02 52 39.403 +11 15 05.44 V C57
2021-10-17 20:43:56 s 1 +37432.924 0 +366450.50 8030.0 C57
2021-10-17 20:53:56 S 02 52 39.127 +11 14 55.28 V C57
2021-10-17 20:53:56 s 1 +37068.929 0 +366554.37 7630.0 C57
2021-10-17 21:03:56 S 02 52 39.115 +11 14 44.20 V C57
2021-10-17 21:03:56 s 1 +36704.828 0 +366657.19 6940.0 C57
2021-10-17 21:13:56 S 02 52 38.892 +11 14 32.35 V C57
2021-10-17 21:13:56 s 1 +36340.620 0 +366758.94 5960.0 C57
2021-10-17 21:23:56 S 02 52 38.784 +11 14 24.50 V C57
2021-10-17 21:23:56 s 1 +35976.307 0 +366859.64 4690.0 C57
2021-10-17 21:33:56 S 02 52 38.808 +11 14 12.37 V C57
2021-10-17 21:33:56 s 1 +35611.890 0 +366959.29 3130.0 C57
2021-10-17 21:43:56 S 02 52 38.580 +11 14 01.46 V C57
2021-10-17 21:43:56 s 1 +35247.370 0 +367057.87 1300.0 C57
2021-10-17 21:53:56 S 02 52 38.551 +11 13 54.52 V C57
2021-10-17 21:53:56 s 1 +34882.749 0 +367155.40 9200.0 C57
2021-10-17 22:13:56 S 02 52 38.318 +11 13 30.79 V C57
2021-10-17 22:13:56 s 1 +34153.204 0 +367347.30 4170.0 C57
2021-10-17 22:23:56 S 02 52 38.203 +11 13 21.58 V C57
2021-10-17 22:23:56 s 1 +33788.283 0 +367441.67 1260.0 C57
2021-10-17 22:33:56 S 02 52 38.078 +11 13 13.80 V C57
2021-10-17 22:33:56 s 1 +33423.265 0 +367534.98 8090.0 C57
2021-10-17 22:43:56 S 02 52 38.006 +11 13 01.34 V C57
2021-10-17 22:43:56 s 1 +33058.150 0 +367627.23 4670.0 C57
2021-10-17 22:53:56 S 02 52 38.040 +11 12 49.75 V C57
2021-10-17 22:53:56 s 1 +32692.940 0 +367718.43 990.0 C57
2021-10-17 23:03:56 S 02 52 37.697 +11 12 41.83 V C57
2021-10-17 23:03:56 s 1 +32327.636 0 +367808.58 7070.0 C57
2021-10-17 23:13:56 S 02 52 37.651 +11 12 29.70 V C57
2021-10-17 23:13:56 s 1 +31962.239 0 +367897.67 2900.0 C57
2021-10-17 23:23:56 S 02 52 37.577 +11 12 17.64 V C57
2021-10-17 23:23:56 s 1 +31596.749 0 +367985.71 8490.0 C57
2021-10-17 23:33:56 S 02 52 37.255 +11 12 09.65 V C57
2021-10-17 23:33:56 s 1 +31231.169 0 +368072.69 3840.0 C57
2021-10-17 23:43:56 S 02 52 37.222 +11 12 02.45 V C57
2021-10-17 23:43:56 s 1 +30865.498 0 +368158.62 8960.0 C57
2021-10-17 23:53:56 S 02 52 37.142 +11 11 46.50 V C57
2021-10-17 23:53:56 s 1 +30499.739 0 +368243.50 3850.0 C57
2021-10-18 00:03:56 S 02 52 37.090 +11 11 38.26 V C57
2021-10-18 00:03:56 s 1 +30133.892 0 +368327.32 8510.0 C57
2021-10-18 00:13:56 S 02 52 36.893 +11 11 28.75 V C57
2021-10-18 00:13:56 s 1 +29767.958 0 +368410.09 2950.0 C57
2021-10-18 00:23:56 S 02 52 36.917 +11 11 17.41 V C57
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2021-11-13 07:00:00 55352696.248 1 us 8560 -14 -14
2021-11-14 05:40:00 52231075.023 1 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m)